196 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



B0rgesen 1915-20, p. 195, figs. 184-187; Taylor 1928, p. 205. 



Lamouroux (1816, p. 270) presented /. adhaerens as follows: "408. 

 J. Adherents; rameaux divergents, meles, fragiles, de la grosseur au 

 plus d'un cheveu, adherents au papier par la dessication; coleur verdatre. 

 J. Adhaerens ; ramis divaricatis, intertextis, f ragilibus, capillaribus, des- 

 sicatione chartae adhaerentibus. Mediterranee ? Ded. Balbis." He did not 

 illustrate this species. There is, therefore, nothing in the original publica- 

 tion to tell us the diameter or proportions of the segments exactly, and 

 little about the general character of the plant. 



One notes that Howe (1920, p. 589) and B0rgesen (1915-20, p. 198) 

 differ in their understanding of /. adhaerens and /. capillacea. It may be 

 that the type of J. adhaerens does not exist ; Howe recognizes that there 

 is doubt respecting its Mediterranean source. Certainly Kiitzing's idea of 

 it is more clear; he figured (1858, p. 40, pi. 83, figs, d, f) material from 

 the Red Sea ; fig. d represents, probably, a mixture of species, the erect type 

 perhaps /. rubens. It is unwise to try to decide the diameter of the seg- 

 ments from his figures, but it is possible to establish their proportions and 

 it appears, excluding uncharacteristic segments, that they are 5-8 times 

 as long as broad. The writer has specimens from the Red Sea coll. 

 Schimper no. 938 from Kosseir, and from El Tor; their segment ratio 

 ranges from 2.5-6.0 times as long as broad, and near the top of the plant 

 or at upper forks sometimes the segments are even shorter. The diameters 

 run from 110-185 fx, excluding aberrant attenuate branches. Areschoug 

 in J. Agardh (1852, p. 559) considered J. adhaerens Lamouroux in the 

 Species Inquirendae, and gave neither diameter nor proportions of the 

 segments. The length ratio of 6-10 times the diameter for /. adhaerens 

 appears in Yendo (1902, p. 24) with a diameter of 80 fi. Weber and 

 Foslie (1904, p. 107) give no data. Olcamura (1936, p. 529) gives the 

 same ratio as Yendo. B0rgesen (loc. cit.) cites Kiitzing's figures g and h, 

 but these are figures of the variety incrustata, rather than the species as 

 Kiitzing understood it, while fig. i is a portion covered with Melobesia 

 granulata. B0rgesen gives diameters of 30-60 /x in the upper segments and 

 100-150 IX. in the lower parts of older plants, and a segment length of 5-8 

 diameters. DeToni (1905, p. 1839) quotes a length of 6-10 diameters 

 for /. adhaerens, probably from Yendo, though Kutzing (1849, p. 710) 

 gives neither diameter nor proportions. 



We have no access at this time to the Harveyan type of /. capillacea, 

 nor does his description give the diameter measurements, but Howe (loc. 

 cit.) gives a diameter of 50-100 ju,, and the writer has collected similar 

 plants from Florida and the Caribbean area. Harvey gives a segment 

 length of 4-6 times the diameter for his /. capillacea. 



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